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 #include &lt;QtGui&gt;
 #include &lt;stdlib.h&gt;

 #include &quot;mainwindow.h&quot;
 #include &quot;piecesmodel.h&quot;
 #include &quot;puzzlewidget.h&quot;

 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
 {
     setupMenus();
     setupWidgets();
     model = new PiecesModel(this);
     piecesList-&gt;setModel(model);

     setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
     setWindowTitle(tr(&quot;Puzzle&quot;));
 }

 void MainWindow::openImage(const QString &amp;path)
 {
     QString fileName = path;

     if (fileName.isNull())
         fileName = QFileDialog::getOpenFileName(this,
             tr(&quot;Open Image&quot;), &quot;&quot;, tr(&quot;Image Files (*.png *.jpg *.bmp)&quot;));

     if (!fileName.isEmpty()) {
         QPixmap newImage;
         if (!newImage.load(fileName)) {
             QMessageBox::warning(this, tr(&quot;Open Image&quot;),
                                  tr(&quot;The image file could not be loaded.&quot;),
                                  QMessageBox::Cancel);
             return;
         }
         puzzleImage = newImage;
         setupPuzzle();
     }
 }

 void MainWindow::setCompleted()
 {
     QMessageBox::information(this, tr(&quot;Puzzle Completed&quot;),
         tr(&quot;Congratulations! You have completed the puzzle!\n&quot;
            &quot;Click OK to start again.&quot;),
         QMessageBox::Ok);

     setupPuzzle();
 }

 void MainWindow::setupPuzzle()
 {
     int size = qMin(puzzleImage.width(), puzzleImage.height());
     puzzleImage = puzzleImage.copy((puzzleImage.width() - size)/2,
         (puzzleImage.height() - size)/2, size, size).scaled(400,
             400, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

     qsrand(QCursor::pos().x() ^ QCursor::pos().y());

     model-&gt;addPieces(puzzleImage);
     puzzleWidget-&gt;clear();
 }

 void MainWindow::setupMenus()
 {
     QMenu *fileMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;File&quot;));

     QAction *openAction = fileMenu-&gt;addAction(tr(&quot;&amp;Open...&quot;));
     openAction-&gt;setShortcut(QKeySequence(tr(&quot;Ctrl+O&quot;)));

     QAction *exitAction = fileMenu-&gt;addAction(tr(&quot;E&amp;xit&quot;));
     exitAction-&gt;setShortcut(QKeySequence(tr(&quot;Ctrl+Q&quot;)));

     QMenu *gameMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;Game&quot;));

     QAction *restartAction = gameMenu-&gt;addAction(tr(&quot;&amp;Restart&quot;));

     connect(openAction, SIGNAL(triggered()), this, SLOT(openImage()));
     connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(restartAction, SIGNAL(triggered()), this, SLOT(setupPuzzle()));
 }

 void MainWindow::setupWidgets()
 {
     QFrame *frame = new QFrame;
     QHBoxLayout *frameLayout = new QHBoxLayout(frame);

     piecesList = new QListView;
     piecesList-&gt;setDragEnabled(true);
     piecesList-&gt;setViewMode(QListView::IconMode);
     piecesList-&gt;setIconSize(QSize(60, 60));
     piecesList-&gt;setGridSize(QSize(80, 80));
     piecesList-&gt;setSpacing(10);
     piecesList-&gt;setMovement(QListView::Snap);
     piecesList-&gt;setAcceptDrops(true);
     piecesList-&gt;setDropIndicatorShown(true);

     PiecesModel *model = new PiecesModel(this);
     piecesList-&gt;setModel(model);

     puzzleWidget = new PuzzleWidget;

     connect(puzzleWidget, SIGNAL(puzzleCompleted()),
             this, SLOT(setCompleted()), Qt::QueuedConnection);

     frameLayout-&gt;addWidget(piecesList);
     frameLayout-&gt;addWidget(puzzleWidget);
     setCentralWidget(frame);
 }</pre>
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